<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        const str1 = "hell ' o1";
        const str2 = 'hell  "o 2';
        const str3 = `hell ' " o3`;

        console.log(str1);
        console.log(str2);
        console.log(str3);
        /* 
        const num1 = "10";
        const num2 = 20;
        const num3 = 30;
        */
    </script>
</body>

</html>